DON’T configure event using that tool. If you use our plugin, you must configure events on the plugin’s Events page.
The reason is simple: events configure using Meta’s tool will not work server-side. That’s a browser-only tool.
As for why it doesn’t work, I can’t answer your question. It does normally work and I am not aware of such a problem. You can contact Meta’s support about it. However, as mentioned previously, you should not use it to configure events if you want them to work server-side too.
PS. Keep in mind that the plugin fires a number of events automatically. Make sure you really need to configure new events. Example: we fire all the required events for WooCommerce.